A5055262354- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Crystal Structures and Properties
- Diamond and Carbon-based Materials Research
- Nuclear materials and radiation effects
- earthquake and tectonic studies
- Inorganic Chemistry and Materials
- Inorganic Fluorides and Related Compounds
- Astro and Planetary Science
- Boron and Carbon Nanomaterials Research
- Chemical Synthesis and Characterization
- Crystallography and molecular interactions
- Rare-earth and actinide compounds
- Methane Hydrates and Related Phenomena
- Metal and Thin Film Mechanics
- Phase Equilibria and Thermodynamics
- Intermetallics and Advanced Alloy Properties
- Force Microscopy Techniques and Applications
- Polyoxometalates: Synthesis and Applications
- Radioactive element chemistry and processing
- Zeolite Catalysis and Synthesis
- MXene and MAX Phase Materials
- Electronic and Structural Properties of Oxides
European Synchrotron Radiation Facility
2022-2025
Deutsches Elektronen-Synchrotron DESY
2017-2024
University of Bayreuth
2015-2017
University of Bern
2013-2015
Institute of Geology of Ore Deposits Petrography Mineralogy and Geochemistry
2014
St Petersburg University
2009-2013
Kumamoto University
2011
University of Warsaw
2011
Studies of polynitrogen phases are great interest for fundamental science and the design novel high energy density materials. Laser heating pure nitrogen at 140 GPa in a diamond anvil cell led to synthesis polymeric allotrope with black phosphorus structure, bp-N. The structure was identified situ using synchrotron single-crystal x-ray diffraction further studied by Raman spectroscopy functional theory calculations. discovery bp-N brings line heavier pnictogen elements, resolves...
The recent revolution in the superconductivity field stems from hydride superconductors. Multicomponent hydrides provide a crucial platform for tracking high-temperature Besides high superconducting transition temperature (Tc), achieving both giant upper critical magnetic [μ0Hc2(0)] and current density [Jc(0)] is also key to latent potential of application In this work, we have successfully synthesized quaternary La–Y–Ce with excellent properties under moderate pressure by using concept...
Abstract Gibbs energy representations for ices II, III, V, and VI are reported. These were constructed using new measurements of volumes at high pressure over a range low temperatures combined with calculated vibrational energies grounded in statistical physics. The collection released within the open source SeaFreeze program, together representation already known ice Ih water. This program allows accurate determination thermodynamics properties (phase boundaries, density, specific heat,...
Mercury's metallic core is expected to have formed under highly reducing conditions, resulting in the presence of significant quantities silicon alloyed iron. Here we present phase diagram Fe-FeSi system, reconstructed from situ X-ray diffraction measurements at pressure and temperature conditions spanning over those for core, ex chemical analysis recovered samples. Under high pressure, do not observe a miscibility gap between cubic fcc B2 structures, but rather formation re-entrant bcc...
The yttrium-hydrogen system has gained attention because of near-ambient temperature superconductivity reports in yttrium hydrides at high pressures. We conducted a study using synchrotron single-crystal x-ray diffraction (SCXRD) 87 to 171 GPa, resulting the discovery known (two YH
Fast compression experiments performed using dynamic diamond anvil cells (dDACs) employing piezoactuators offer the opportunity to study compression-rate dependent phenomena. In this paper, we describe an experimental setup which allows us perform time-resolved x-ray diffraction during fast of materials improved dDACs. The combination high flux available a 25.6 keV beam focused with linear array compound refractive lenses and two GaAs LAMBDA detectors at Extreme Conditions Beamline (P02.2)...
In this overview article, we present the main features of upgraded ID27 beamline which is fully optimised to match exceptional characteristics new Extremely Bright Source (EBS) European Synchrotron Radiation Facility (ESRF). The has been converted a 120-m-long instrument and undergone major refurbishment all its critical components including both hardware software environments. We will successively introduce undulator X-ray source, optical scheme experimental hutch. illustrate potential...
Abstract Feldspars are rock-forming minerals that make up most of the Earth’s crust. Along mantle geotherm, feldspars stable at pressures to 3 GPa and may persist metastably higher under cold conditions. Previous structural studies limited ~10 GPa, have shown dominant mechanism pressure-induced deformation is tilting AlO 4 SiO tetrahedra in a tetrahedral framework. Herein, based on results situ single-crystal X-ray diffraction 27 we report discovery new high-pressure polymorphs anorthite...
Sodium chloride is expected to be found on many of the surfaces icy moons like Europa and Ganymede. However, spectral identification remains elusive as known NaCl-bearing phases cannot match current observations, which require higher number water hydration. Working at relevant conditions for worlds, we report characterization three "hyperhydrated" sodium (SC) hydrates, refined two crystal structures [2NaCl·17H2O (SC8.5); NaCl·13H2O (SC13)]. We that dissociation Na+ Cl- ions within these...
Here we report the synthesis of metallic, ultraincompressible (bulk modulus $K_{0}$ = 428(10) GPa) and very hard (nanoindentation hardness 36.7(8) rhenium (V) nitride pernitride Re$_{2}$(N$_{2}$)N$_{2}$. While empirical chemical formula compound, ReN$_{2}$, is same as for other known transition metals pernitrides, e.g. IrN$_{2}$, PtN$_{2}$, PdN$_{2}$ OsN$_{2}$, its crystal chemistry unique. The pernitrides consist a metal in oxidation state +IV anions N$_{2}^{4-}$. ReN$_{2}$ contains both...
Two novel ternary compounds, yttrium borate oC20-YBO3 and orthocarbonate hR39-Y3(CO4)2, were synthesized at 90 120 GPa upon heating to about 3500 K in a laser-heated diamond anvil cell. Their crystal structures solved refined using situ high-pressure synchrotron single-crystal X-ray diffraction. The structure of features previously unobserved infinite unbranched zigzag chains corner-sharing BO4 tetrahedra. compound hR39-Y3(CO4)2 consists isolated [CO4]4- anions represents the first...
Abstract Zadovite, BaCa 6 [(SiO 4 )(PO )](PO ) 2 F ( R 3 m , a = 7.0966(1) Å, c 25.7284(3), V 1122.13(3) Å Z 3) and aradite, )(VO )] (VO 7.1300(1), 26.2033(9) 1153.63(6) are two new mineral species of novel modular structure type related closely to the nabimusaite, KCa 12 (SiO (SO O F. Both minerals occur in paralavas enclosed pyrometamorphic rocks Hatrurim Complex, Negev desert, Israel. Zadovite aradite colourless, transparent with white streak, have vitreous lustre an uneven fracture....
A Verwey-type charge-ordering transition in magnetite at 120 K leads to the formation of linear units three iron ions with one shared electron, called trimerons. The recently-discovered pentoxide (Fe4O5) comprising mixed-valent cations octahedral chains, demonstrates another unusual 150 involving competing trimerons and dimerons. Here, we experimentally show that applied pressure can tune pattern Fe4O5 strongly affect ordering temperature. We report two charge-ordered phases, first which may...
A laser heating system for samples confined in diamond anvil cells paired with situ X-ray diffraction measurements at the Extreme Conditions Beamline of PETRA III is presented. The features two independent configurations (on-axis and off-axis path) allowing a broad range experiments using different designs cells. power continuous source can be modulated use various pulsed or flash applications. An example such an application illustrated here on melting curve iron megabar pressures. optical...
Abstract Melting experiments of Fe 3 C were conducted to 85 GPa in laser‐heated diamond anvil cells with situ X‐ray diffraction and post‐experiment textural observation. From the determined pressure‐temperature conditions melting curve for C, together literature data on point eutectic system Fe‐Fe C/Fe 7 under high pressures, we established a self‐consistent thermodynamic model high‐pressure Fe‐C including mixing parameters liquids. The results show that liquids is negatively nonideal from 1...
<title>Abstract</title> Large ocean worlds in the solar system and other planetary systems likely contain significant fraction of volatile organic compounds, which condition their habitability potential. Some these compounds are known to combine with water molecules form clathrate hydrates under pressure. However, clathration process complex compositions high pressures representative still remain unexplored. Herein we report on first experimental results characterization pressure-induced...
The behavior of iron carbonates at high pressures is relevant for geological processes occurring in Earth interiors. Here, cubic sp3-carbonate Fe2[C4O10] was synthesized diamond anvil cell by reacting Fe2O3 and CO2 65(4) GPa 3000(±500) K, simulating the environment localized thermal anomalies mantle. crystal structure, determined situ single-crystal X-ray diffraction, features pyramidal [C4O10]4- anions. experimental structure corresponds to a structural model from density functional theory...
We report the results of single-crystal X-ray diffraction and Raman spectroscopy studies scandium oxide, Sc2O3, at ambient temperature under high pressure up to 55 28 GPa, respectively. Both indicated a phase transition from cubic bixbyite (so-called C-Res phase) monoclinic C2/m B-Res pressures around 25–28 GPa. The was accompanied by significant volumetric drop ∼6.7%. In addition, detected minor crossover 10–12 which manifested in appearance new disappearance some modes, as well softening...